Old 01-21-17, 07:24 PM
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Is the sprocket itself wiggling, or the whole driver?

Put another way: do you have play (felt as knocking) at the rim if you grab the top of the tire and wiggle it side to side?

The sprocket's mounting lugs can wear out, but I imagine the sprocket teeth would be severely worn out by the time that happened. It is uncommon for there to be any issues with the sprocket's mount, it's usually play in the hub that needs to be adjusted out.

A coaster brake can absolutely be run with no play in the axle, by the way--just to jump ahead of the train that will (inevitably) come running through here saying it needs play.
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